Radium

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Radium Quick Reference

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Notes

Symbol

Ra

Atomic Number

88

Oxidation States

2

Pauling Electronegativity

0.9

Electron Configuration

Orbital Occupancy

[Rn] 7s2

[Rn] represents the closed-shell electron configuration of radon

Orbital Filling Order

[Rn] 7s2

[Rn] represents the closed-shell electron configuration of radon

Term Symbol

1S0

see expanded configuration ...

Ionization Energies

I  (1)

 5.278423 eV

II (2)

10.14715 eV 

Electron Affinity

0.10 eV

Density

liquid, 973.15 K

4.615 g/ml 

solid, 25 °C

5.000 g/cm3

Molar Volume

solid, 298 K, 1 atm

41.09 cm3/mol

Melting Point

973.15 K

Boiling Point

1 atm

1799.15 K

Thermal Conductivity

solid, 293 K

18.6 W/(m K)

provisional value

Pyykkö Covalent Radius

single bond

201 pm

double bond

173 pm

triple bond

159 pm

Enthalpy of Fusion

1 atm

7.15 kJ/mol

Enthalpy of Vaporization

1 atm

136.8 kJ/mol

Quantity

Radium Atomic Structure

Notes

Ionization Energies

I  (1)

 5.278423 eV

II (2)

10.14715 eV 

Electron Affinity

0.10 eV

Electron Binding Energies

K    (1s)

103922 eV

LI   (2s)

 19237 eV

LII  (2p1/2)

 18484 eV

LIII (2p3/2)

 15444 eV

see all 24 energies ...

Electron Configuration

Orbital Occupancy

[Rn] 7s2

[Rn] represents the closed-shell electron configuration of radon

Orbital Filling Order

[Rn] 7s2

[Rn] represents the closed-shell electron configuration of radon

Term Symbol

1S0

see expanded configuration ...

Fluorescence Yields

ωK

0.968

ωL1

0.150

ωL2

0.476

ωL3

0.404

Coster-Kronig Yields

F12

0.047

F13

0.62 

F23

0.107

Quantity

Radium Physical Properties

Notes

Density

liquid, 973.15 K

4.615 g/ml 

solid, 25 °C

5.000 g/cm3

Molar Volume

solid, 298 K, 1 atm

41.09 cm3/mol

Physical Form

white metal

Young's Modulus

13.2 GPa

Electrical Resistivity

solid, 293 K

41×10-8 Ohm m

Isothermal Bulk Modulus

300 K

13.2 GPa

estimated

Isothermal Compressibility

300 K

0.076 GPa-1

estimated

Gram Atomic Volume

45 cm3

Quantity

Radium Atomic Interaction

Notes

Oxidation States

2

Pauling Electronegativity

0.9

Mulliken-Jaffe Electronegativity

hybridsp

0.92

Allred-Rochow Electronegativity

0.97

Nagle Electronegativity

0.99

Cohesive Energy

per mole

160 kJ/mol    

per atom

  1.66 eV/atom

Quantity

Radium Thermodynamics

Notes

Melting Point

973.15 K

Boiling Point

1 atm

1799.15 K

Thermal Conductivity

solid, 293 K

18.6 W/(m K)

provisional value

Critical Point

3510 K

Vapor Pressure

1526 °C

100 kPa

1173 °C

10 kPa

936 °C

1 kPa

764 °C

100 Pa

633 °C

10 Pa

546 °C

1 Pa

Enthalpy of Fusion

1 atm

7.15 kJ/mol

Enthalpy of Vaporization

1 atm

136.8 kJ/mol

Debye Temperature

Low Temperature Limit ( 0 K )

89 K

Quantity

Radium Identification

Notes

CAS Number

7440-14-4

Quantity

Radium Atomic Size

Notes

Orbital Radius

204.2 pm

Pyykkö Covalent Radius

single bond

201 pm

double bond

173 pm

triple bond

159 pm

Cordero Covalent Radius

221 pm

Shannon-Prewitt Crystal Radius

ion charge: +2

coordination number: 8

162 pm

coordination number: 12

184 pm

Shannon-Prewitt Effective Ionic Radius

ion charge: +2

coordination number: 8

148 pm

coordination number: 12

170 pm

Pauling Empirical Crystal Radius

ion charge: +2

140 pm

Slater Atomic-Ionic Radius

215 pm

Quantity

Radium History

Notes

Discovery

date of discovery

1898

discoverer

Marie Sklodowska Curie

birth

November 7, 1867

death

July 4, 1934

discoverer

Pierre Curie

birth

May 15, 1859

death

April 19, 1906

location of discovery

Paris, France

Origin of Element Name

origin

radius

origin description

property—Latin for ray

Origin of Element Symbol

symbol: Ra

origin

radium

origin description

element name

U.S. Towns Named After Elements

Radium, Colorado

Radium, Kansas

Radium Springs, Georgia

Quantity

Radium Abundances

Notes

Earth's Crust

9×10-7 ppm

Ocean Water

1×10-10 ppm

River Water

4×10-10 ppm

Human Body

31×10-9 mg

based on a 70 kg "reference man"

Human Bone

4×10-9 ppm

Human Hair

19×10-9 ppm

Human Kidney

6×10-9 ppm

Human Liver

0.72×10-9 ppm

Human Muscle

0.23×10-9 ppm

Quantity

Radium Nomenclature

Notes

Element Names in Other Languages

French

radium

German

Radium

Italian

radio

Spanish

radio

Portuguese

rádio

Anions or Anionic Substituent Groups

radide

Cations or Cationic Substituent Groups

radium

Ligands

radido

Heteroatomic Anion

radate

'a' Term—Substitutive Nomenclature

rada

'y' Term—Chains and Rings Nomenclature

rady

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